The format is a text one and is pretty obvious to anyone familiar with .map files. For some bazaar reason Valve STILL chooses to save faces as planes. This I will never understand (is it Hammer maybe)?

Well, the Object Viewer I previewed earlier is built on a framework called "Crafty" that I'm working on and currently TG is running on this framework. This provides a lot of the required base code, however, TG still has a long way to go before it is complete and I'm working on so many projects at the moment with so many people interested in different ones that it is hard to concentrate on one specific project.